1 | /* |
2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. |
3 | * |
4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
5 | * this file except in compliance with the License. You can obtain a copy |
6 | * in the file LICENSE in the source distribution or at |
7 | * https://www.openssl.org/source/license.html |
8 | */ |
9 | |
10 | #include <openssl/idea.h> |
11 | #include "idea_local.h" |
12 | |
13 | void IDEA_cbc_encrypt(const unsigned char *in, unsigned char *out, |
14 | long length, IDEA_KEY_SCHEDULE *ks, unsigned char *iv, |
15 | int encrypt) |
16 | { |
17 | register unsigned long tin0, tin1; |
18 | register unsigned long tout0, tout1, xor0, xor1; |
19 | register long l = length; |
20 | unsigned long tin[2]; |
21 | |
22 | if (encrypt) { |
23 | n2l(iv, tout0); |
24 | n2l(iv, tout1); |
25 | iv -= 8; |
26 | for (l -= 8; l >= 0; l -= 8) { |
27 | n2l(in, tin0); |
28 | n2l(in, tin1); |
29 | tin0 ^= tout0; |
30 | tin1 ^= tout1; |
31 | tin[0] = tin0; |
32 | tin[1] = tin1; |
33 | IDEA_encrypt(tin, ks); |
34 | tout0 = tin[0]; |
35 | l2n(tout0, out); |
36 | tout1 = tin[1]; |
37 | l2n(tout1, out); |
38 | } |
39 | if (l != -8) { |
40 | n2ln(in, tin0, tin1, l + 8); |
41 | tin0 ^= tout0; |
42 | tin1 ^= tout1; |
43 | tin[0] = tin0; |
44 | tin[1] = tin1; |
45 | IDEA_encrypt(tin, ks); |
46 | tout0 = tin[0]; |
47 | l2n(tout0, out); |
48 | tout1 = tin[1]; |
49 | l2n(tout1, out); |
50 | } |
51 | l2n(tout0, iv); |
52 | l2n(tout1, iv); |
53 | } else { |
54 | n2l(iv, xor0); |
55 | n2l(iv, xor1); |
56 | iv -= 8; |
57 | for (l -= 8; l >= 0; l -= 8) { |
58 | n2l(in, tin0); |
59 | tin[0] = tin0; |
60 | n2l(in, tin1); |
61 | tin[1] = tin1; |
62 | IDEA_encrypt(tin, ks); |
63 | tout0 = tin[0] ^ xor0; |
64 | tout1 = tin[1] ^ xor1; |
65 | l2n(tout0, out); |
66 | l2n(tout1, out); |
67 | xor0 = tin0; |
68 | xor1 = tin1; |
69 | } |
70 | if (l != -8) { |
71 | n2l(in, tin0); |
72 | tin[0] = tin0; |
73 | n2l(in, tin1); |
74 | tin[1] = tin1; |
75 | IDEA_encrypt(tin, ks); |
76 | tout0 = tin[0] ^ xor0; |
77 | tout1 = tin[1] ^ xor1; |
78 | l2nn(tout0, tout1, out, l + 8); |
79 | xor0 = tin0; |
80 | xor1 = tin1; |
81 | } |
82 | l2n(xor0, iv); |
83 | l2n(xor1, iv); |
84 | } |
85 | tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; |
86 | tin[0] = tin[1] = 0; |
87 | } |
88 | |
89 | void IDEA_encrypt(unsigned long *d, IDEA_KEY_SCHEDULE *key) |
90 | { |
91 | register IDEA_INT *p; |
92 | register unsigned long x1, x2, x3, x4, t0, t1, ul; |
93 | |
94 | x2 = d[0]; |
95 | x1 = (x2 >> 16); |
96 | x4 = d[1]; |
97 | x3 = (x4 >> 16); |
98 | |
99 | p = &(key->data[0][0]); |
100 | |
101 | E_IDEA(0); |
102 | E_IDEA(1); |
103 | E_IDEA(2); |
104 | E_IDEA(3); |
105 | E_IDEA(4); |
106 | E_IDEA(5); |
107 | E_IDEA(6); |
108 | E_IDEA(7); |
109 | |
110 | x1 &= 0xffff; |
111 | idea_mul(x1, x1, *p, ul); |
112 | p++; |
113 | |
114 | t0 = x3 + *(p++); |
115 | t1 = x2 + *(p++); |
116 | |
117 | x4 &= 0xffff; |
118 | idea_mul(x4, x4, *p, ul); |
119 | |
120 | d[0] = (t0 & 0xffff) | ((x1 & 0xffff) << 16); |
121 | d[1] = (x4 & 0xffff) | ((t1 & 0xffff) << 16); |
122 | } |
123 | |